DOC: release-notes missing for 3.0.7 release

[TomAugspurger]

Describe the issue linked to the documentation

https://zarr.readthedocs.io/en/v3.0.7/release-notes.html

Suggested fix for documentation

No response

[d-v-b]

oops, that's on me. I'll look into creating the release notes after dinner, unless someone fixes it before me

[dstansby]

I think how to do this is explained in the release guide, but suggestions to improve that or move the release guide somewhere more obvious would be very welcome!

[jhamman]

@dstansby - do you think there is a way for us to automate this? Spit balling here: perhaps we could create a github action that creates the doc consolidation PR based on a workflow dispatch? Or could we do this in the read-the-docs build?